Why is the Audi A2 considered a revolutionary vehicle?

I've heard people mention the Audi A2 as a game-changing car, but what exactly makes it so revolutionary?

The Audi A2 was the first mass-produced car to extensively use aluminum for its lightweight construction, resulting in improved efficiency and performance.

Not only is the Audi A2 lightweight, but it also features an aerodynamic design that reduces drag and further increases its efficiency and overall driving experience.

The Audi A2 was also ahead of its time in terms of technology, with features such as an onboard computer, keyless entry, and infrared remote control for central locking.